astronomy

Gliese 367

Gliese 367 is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Gliese 367 rather than just read about it. In short: Gliese 367 (GJ 367, formally named Añañuca) is a red dwarf star in the constellation of Vela. It is relatively nearby, with a distance of 30.7 light-years (9.4 parsecs) from Earth as measured from its parallax.

Key takeaways

Gliese 367 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Gliese 367 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gliese 367 from memory before moving on to harder problems.

Reference excerpt

Gliese 367 (GJ 367, formally named Añañuca) is a red dwarf star in the constellation of Vela. It is relatively nearby, with a distance of 30.7 light-years (9.4 parsecs) from Earth as measured from its parallax. It hosts three known exoplanets, Gliese 367 b, c & d.

Characteristics A red dwarf star, Gliese 367 is smaller, cooler, and much fainter than the Sun. It has 0.457 times the Sun's radius, an effective temperature of 3522 K, and a luminosity just 2.88% that of the Sun. Initial measurements from stellar isochrones suggested a young age of less than 60 million years old, but its orbit around the Milky Way is highly eccentric, unusual for a young star. It may have been forced into such an orbit via a gravitational encounter. However, a 2023 study, based on spectroscopic observations, found that its age should be much higher. Estimates from gyrochronology give an age in the range of 4.6 to 4.8 billion years. Rotation-age relations suggest a value of 7.95±1.31 billion years. It is suspected to be a variable with amplitude 0.012 stellar magnitude and period 5.16 years. A stellar multiplicity survey in 2015 failed to detect any stellar companions to Gliese 367.

Nomenclature The designation Gliese 367 comes from the Gliese Catalogue of Nearby Stars. This was the 367th star listed in the first edition of the catalogue. In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project. The approved names, proposed by a team from Chile, were announced in June 2023. Gliese 367 is named Añañuca and its innermost planet is named Tahay, after names for the endemic Chilean wildflowers Phycella cyrtanthoides and Calydorea xiphioides.

Planetary system The star Gliese 367 was observed by TESS in February-March 2019, leading to its designation as an object of interest, and by January 2021 additional radial velocity data suggested the existence of a short-period planet, albeit with low certainty. The planet's existence was confirmed by both ground-based and satellite-based transit photometry data by December 2021. Gliese 367 b is a close-orbiting sub-Earth that takes just 7.7 hours to orbit its star, one of the shortest orbits of any planet. Due to its close orbit, the exoplanet gets bombarded with radiation over 500 times what Earth receives from the Sun. Dayside temperatures on GJ 367b are around 1,500 °C (1,770 K; 2,730 °F). Due to its close orbit, it most likely is tidally locked. The atmosphere of Gliese 367 b, due to the extreme temperatures, would have boiled away along with signs of life. The core of GJ 367b is likely composed of iron and nickel, making its core similar to Mercury's core. The core of GJ 367b is extremely dense, making up most of the planet's mass. A direct imaging study in 2022 failed to find any additional planets or stellar companions around Gliese 367. This rules out any companions at distances greater than 5 AU with masses greater than 20 MJ (for an age of 5 billion years). The discovery of two additional super-Earth-mass planets with periods of 11.5 and 34 days was published in 2023.

Worked examples

Example 1 — a first encounter with Gliese 367

Start with the simplest possible case. Write down what Gliese 367 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Gliese 367 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Gliese 367 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Gliese 367

In research: Gliese 367 appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Gliese 367 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Gliese 367 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Gliese and GJ objects, Hipparcos objects, so understanding it makes those chapters shorter.
In everyday life: Look for Gliese 367 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Gliese 367 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gliese 367 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Gliese 367 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gliese 367 in simple terms?

Why does Gliese 367 matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Gliese 367?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Gliese 367.